regulator: max77843: Add max77843 regulator driver
authorJaewon Kim <jaewon02.kim@samsung.com>
Thu, 5 Feb 2015 06:35:58 +0000 (15:35 +0900)
committerMark Brown <broonie@kernel.org>
Thu, 5 Feb 2015 17:33:39 +0000 (17:33 +0000)
This patch adds new regulator driver to support max77843
MFD(Multi Function Device) chip`s regulators.
The Max77843 has two voltage regulators for USB safeout.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/max77843.c [new file with mode: 0644]

index c3a60b5..c1f9c33 100644 (file)
@@ -414,6 +414,14 @@ config REGULATOR_MAX77802
          Exynos5420/Exynos5800 SoCs to control various voltages.
          It includes support for control of voltage and ramp speed.
 
+config REGULATOR_MAX77843
+       tristate "Maxim 77843 regulator"
+       depends on MFD_MAX77843
+       help
+         This driver controls a Maxim 77843 regulator.
+         The regulator include two 'SAFEOUT' for USB(Universal Serial Bus)
+         This is suitable for Exynos5433 SoC chips.
+
 config REGULATOR_MC13XXX_CORE
        tristate
 
index 1f28ebf..12408d6 100644 (file)
@@ -55,6 +55,7 @@ obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
 obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
 obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o
+obj-$(CONFIG_REGULATOR_MAX77843) += max77843.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
diff --git a/drivers/regulator/max77843.c b/drivers/regulator/max77843.c
new file mode 100644 (file)
index 0000000..c132ef5
--- /dev/null
@@ -0,0 +1,227 @@
+/*
+ * max77843.c - Regulator driver for the Maxim MAX77843
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Author: Jaewon Kim <jaewon02.kim@samsung.com>
+ * Author: Beomho Seo <beomho.seo@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max77843-private.h>
+#include <linux/regulator/of_regulator.h>
+
+enum max77843_regulator_type {
+       MAX77843_SAFEOUT1 = 0,
+       MAX77843_SAFEOUT2,
+       MAX77843_CHARGER,
+
+       MAX77843_NUM,
+};
+
+static const unsigned int max77843_safeout_voltage_table[] = {
+       4850000,
+       4900000,
+       4950000,
+       3300000,
+};
+
+static int max77843_reg_is_enabled(struct regulator_dev *rdev)
+{
+       struct regmap *regmap = rdev->regmap;
+       int ret;
+       unsigned int reg;
+
+       ret = regmap_read(regmap, rdev->desc->enable_reg, &reg);
+       if (ret) {
+               dev_err(&rdev->dev, "Fialed to read charger register\n");
+               return ret;
+       }
+
+       return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
+}
+
+static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
+{
+       struct regmap *regmap = rdev->regmap;
+       unsigned int chg_min_uA = rdev->constraints->min_uA;
+       unsigned int chg_max_uA = rdev->constraints->max_uA;
+       unsigned int val;
+       int ret;
+       unsigned int reg, sel;
+
+       ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
+       if (ret) {
+               dev_err(&rdev->dev, "Failed to read charger register\n");
+               return ret;
+       }
+
+       sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
+
+       if (sel < 0x03)
+               sel = 0;
+       else
+               sel -= 2;
+
+       val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
+       if (val > chg_max_uA)
+               return -EINVAL;
+
+       return val;
+}
+
+static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
+               int min_uA, int max_uA)
+{
+       struct regmap *regmap = rdev->regmap;
+       unsigned int chg_min_uA = rdev->constraints->min_uA;
+       int sel = 0;
+
+       while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
+               sel++;
+
+       if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
+               return -EINVAL;
+
+       sel += 2;
+
+       return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
+}
+
+static struct regulator_ops max77843_charger_ops = {
+       .is_enabled             = max77843_reg_is_enabled,
+       .enable                 = regulator_enable_regmap,
+       .disable                = regulator_disable_regmap,
+       .get_current_limit      = max77843_reg_get_current_limit,
+       .set_current_limit      = max77843_reg_set_current_limit,
+};
+
+static struct regulator_ops max77843_regulator_ops = {
+       .is_enabled             = regulator_is_enabled_regmap,
+       .enable                 = regulator_enable_regmap,
+       .disable                = regulator_disable_regmap,
+       .list_voltage           = regulator_list_voltage_table,
+       .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+       .set_voltage_sel        = regulator_set_voltage_sel_regmap,
+};
+
+static const struct regulator_desc max77843_supported_regulators[] = {
+       [MAX77843_SAFEOUT1] = {
+               .name           = "SAFEOUT1",
+               .id             = MAX77843_SAFEOUT1,
+               .ops            = &max77843_regulator_ops,
+               .of_match       = of_match_ptr("SAFEOUT1"),
+               .regulators_node = of_match_ptr("regulators"),
+               .type           = REGULATOR_VOLTAGE,
+               .owner          = THIS_MODULE,
+               .n_voltages     = ARRAY_SIZE(max77843_safeout_voltage_table),
+               .volt_table     = max77843_safeout_voltage_table,
+               .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,
+               .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
+               .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,
+               .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
+       },
+       [MAX77843_SAFEOUT2] = {
+               .name           = "SAFEOUT2",
+               .id             = MAX77843_SAFEOUT2,
+               .ops            = &max77843_regulator_ops,
+               .of_match       = of_match_ptr("SAFEOUT2"),
+               .regulators_node = of_match_ptr("regulators"),
+               .type           = REGULATOR_VOLTAGE,
+               .owner          = THIS_MODULE,
+               .n_voltages     = ARRAY_SIZE(max77843_safeout_voltage_table),
+               .volt_table     = max77843_safeout_voltage_table,
+               .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,
+               .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
+               .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,
+               .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
+       },
+       [MAX77843_CHARGER] = {
+               .name           = "CHARGER",
+               .id             = MAX77843_CHARGER,
+               .ops            = &max77843_charger_ops,
+               .of_match       = of_match_ptr("CHARGER"),
+               .regulators_node = of_match_ptr("regulators"),
+               .type           = REGULATOR_CURRENT,
+               .owner          = THIS_MODULE,
+               .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
+               .enable_mask    = MAX77843_CHG_MASK,
+       },
+};
+
+static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
+{
+       switch (reg_id) {
+       case MAX77843_SAFEOUT1:
+       case MAX77843_SAFEOUT2:
+               return max77843->regmap;
+       case MAX77843_CHARGER:
+               return max77843->regmap_chg;
+       default:
+               return max77843->regmap;
+       }
+}
+
+static int max77843_regulator_probe(struct platform_device *pdev)
+{
+       struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
+       struct regulator_config config = {};
+       int i;
+
+       config.dev = max77843->dev;
+       config.driver_data = max77843;
+
+       for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
+               struct regulator_dev *regulator;
+
+               config.regmap = max77843_get_regmap(max77843,
+                               max77843_supported_regulators[i].id);
+
+               regulator = devm_regulator_register(&pdev->dev,
+                               &max77843_supported_regulators[i], &config);
+               if (IS_ERR(regulator)) {
+                       dev_err(&pdev->dev,
+                                       "Failed to regiser regulator-%d\n", i);
+                       return PTR_ERR(regulator);
+               }
+       }
+
+       return 0;
+}
+
+static const struct platform_device_id max77843_regulator_id[] = {
+       { "max77843-regulator", },
+       { /* sentinel */ },
+};
+
+static struct platform_driver max77843_regulator_driver = {
+       .driver = {
+               .name = "max77843-regulator",
+       },
+       .probe          = max77843_regulator_probe,
+       .id_table       = max77843_regulator_id,
+};
+
+static int __init max77843_regulator_init(void)
+{
+       return platform_driver_register(&max77843_regulator_driver);
+}
+subsys_initcall(max77843_regulator_init);
+
+static void __exit max77843_regulator_exit(void)
+{
+       platform_driver_unregister(&max77843_regulator_driver);
+}
+module_exit(max77843_regulator_exit);
+
+MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
+MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
+MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
+MODULE_LICENSE("GPL");